A heat-shielding and breathable tent composite fabric and a preparation method thereof

Abstract

The present application belongs to the technical field of textile materials, and relates to a heat-shielding and breathable tent composite fabric and a preparation method thereof. The fabric comprises an outer fabric layer, an intermediate functional film layer and an inner fabric layer. The intermediate functional film layer is composed of polycaprolactone-polyurethane block copolymer with a glass transition temperature of 32 DEG C and 1.5 wt% carbon nanotubes, and is provided with a nanopore structure. When the ambient temperature is greater than or equal to 32 DEG C, the film layer opens the air permeation channel through phase transition, the air permeability is increased to more than 120 mm / s, and the carbon nanotubes accelerate the photo-thermal response; when the temperature is lower than 32 DEG C, the film layer is closed, and the air permeability is less than 5 mm / s. The outer layer is provided with an aluminum reflective film with a coverage rate of 70% to enhance the heat preservation, and the inner layer is provided with a hydrophilic microporous layer to realize one-way moisture management. The fabric can self-adaptively regulate the heat and moisture performance without external energy, and significantly improves the internal thermal comfort and environmental adaptability of the tent.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of textile materials, and relates to a heat-shielding and air-permeable tent composite fabric and a preparation method thereof. BACKGROUND

[0002] As key equipment in scenarios such as outdoor activities, emergency rescue and military camping, the fabric performance of a tent is directly related to the thermal comfort and environmental adaptability of the user. Under the condition of day and night alternation or sudden weather change, the internal microclimate of the tent needs to achieve dynamic balance between efficient heat dissipation and effective heat preservation: in the daytime high-temperature or strong sunlight environment, the fabric should have excellent air permeability and heat-shielding capacity to quickly dissipate accumulated heat; and in the night or low-temperature environment, the air permeability needs to be reduced and the heat insulation performance needs to be enhanced to maintain the internal suitable temperature. This dynamic requirement poses a fundamental challenge to traditional static functional fabrics.

[0003] At present, the mainstream tent fabric on the market mostly adopts a multi-layer composite structure, for example, the outer layer is a high-density polyester or nylon fabric to provide mechanical strength and waterproofness, and the inner layer is supplemented with a microporous polytetrafluoroethylene or polyurethane coating to realize limited air permeability or anti-condensation function. Although such design can provide basic protection under specific working conditions, its air permeability is determined by the inherent pore structure of the material or the thickness of the coating, and cannot be actively adjusted with the change of environmental temperature. Correspondingly, in order to balance the heat dissipation in the daytime and the heat preservation at night, the existing scheme often relies on manual operation of the user, such as opening and closing the ventilation window, increasing or decreasing the inner tent, or covering the thermal blanket, which is not only cumbersome to operate, but also difficult to achieve precise and immediate thermal response. Further, some high-end products attempt to introduce phase change material (PCM) microcapsules to buffer temperature fluctuations, but such materials can only absorb or release latent heat and cannot substantially change the air permeation path of the fabric, and the regulation effect on air exchange efficiency is very limited.

[0004] Simply pursuing high air permeability often leads to rapid heat loss at night, while overemphasizing heat preservation easily causes internal overheating and moisture accumulation in the daytime, and the two are significantly related in physical mechanism. The existing technical path is difficult to break through this performance coupling dilemma, and the reason is that there is a lack of dynamic coupling mechanism between the thermal management behavior of the material and the environmental heat load. Even if carbon-based materials (such as graphene or carbon black) are introduced to improve the infrared reflection or absorption capacity, without the support of corresponding structure adjustability, the on-demand switching of air permeability cannot be achieved. SUMMARY

[0005] To achieve the above-mentioned purposes, the application provides a heat-shielding and air-permeable tent composite fabric and a preparation method thereof. By introducing a heat-responsive intermediate functional film, the composite fabric realizes the dual functions of self-regulating the air permeability and heat-shielding ability according to the ambient temperature without external energy intervention, thereby effectively solving the technical problem that the traditional tent fabric cannot dynamically balance the heat dissipation and heat preservation demand in the scenarios of day and night alternation or sudden weather changes.

[0006] The heat-shielding and air-permeable tent composite fabric comprises an outer fabric layer, an intermediate functional film layer and an inner fabric layer which are sequentially stacked. The outer fabric layer is a high-density polyester or nylon fabric with a higher weft and warp density than 210T, and the surface is treated with fluorocarbon resin waterproofing, with a contact angle greater than 140°, for providing mechanical strength, tear resistance and basic waterproofing function. The inner fabric layer is a lightweight polyester mesh fabric with a grammage of 45g / m² to 65g / m / m² and a porosity of 35% to 50%, for forming an internal air buffer layer and assisting moisture diffusion. The intermediate functional film layer is the core innovative structure of the application, which is composed of a shape memory polymer matrix and uniformly dispersed carbon nanotubes. The film layer undergoes reversible phase transition at a specific temperature threshold, driving the opening or closing of the micro-porous structure, thereby dynamically regulating the air permeability of the overall fabric.

[0007] The thickness of the intermediate functional film layer is 25μm to 80μm, preferably 50μm. The shape memory polymer is a polycaprolactone-polyurethane block copolymer, with a soft segment of polycaprolactone and a number average molecular weight of 80000, and a hard segment of a urethane structure generated by the reaction of 4,4'-methylenebis(phenyl isocyanate) and 1,4-butanediol, with a hard segment content of 25wt%. The glass transition temperature of the shape memory polymer is precisely regulated to 32℃, which corresponds to the critical heat load threshold at which the human body begins to feel hot in a closed space.

[0008] When the ambient temperature is lower than 32℃, the shape memory polymer is in a glass state, the molecular chain segment movement is limited, the film layer is dense and non-porous, and the air permeability is less than 5mm / s (tested according to ASTM D737 standard); when the ambient temperature rises to 32℃ and above, the shape memory polymer undergoes glass-rubber phase transition, the molecular chain segment obtains sufficient kinetic energy, and the preset micro-deformation is triggered, thereby forming through nanoscale air permeation channels in the film layer, and the air permeability is increased to more than 120mm / s.

[0009] The carbon nanotubes are multi-walled carbon nanotubes with an outer diameter of 10nm to 20nm, a length of 1μm to 5μm, and a specific surface area of 250m² / g, with a purity higher than 95%. The mass fraction of the carbon nanotubes in the shape memory polymer matrix is 1.5wt%, and the uniform distribution is achieved by ultrasonic dispersion and high-speed shear mixing process.

[0010] The introduction of carbon nanotubes has a dual function: firstly, as a nano-reinforced phase, it significantly improves the tensile strength and elongation at break of the intermediate film layer, enabling it to maintain structural integrity during repeated phase change cycles, with the measured tensile strength increasing from 8.2 MPa for pure shape memory polymer film to 14.6 MPa; secondly, as an efficient light-heat conversion medium, its high infrared absorption rate can quickly convert solar radiation heat into local heat energy, accelerating the shape memory polymer phase change process and shortening the response time. Experiments show that under standard solar irradiance, the surface temperature of the intermediate film layer containing carbon nanotubes can rise from 25°C to 33°C in 90 seconds, while the pure shape memory polymer film takes 210 seconds.

[0011] The micro-porous structure of the intermediate functional film layer is pre-constructed by a template-assisted phase separation method. Before the shape memory polymer solution is cast into a film, polystyrene microspheres with a particle size of 200 nm are added as pore-forming agents, with a volume fraction of 8%. After film formation, the polystyrene microspheres are removed by tetrahydrofuran solvent extraction, forming regularly distributed spherical pores. When the shape memory polymer is in the glass state, these pores are closed due to the rigidity of the polymer chain segments; when the temperature rises above Tg, the polymer softens, and the material around the pores undergoes elastic contraction, connecting the pores to form a three-dimensional network, thereby achieving dynamic opening of the air permeation channel. This structural design ensures the reversibility and repeatability of pore opening, with a change in air permeability of less than 5% after 500 thermal cycle tests.

[0012] As a preferred embodiment of the present application, a heat-reflecting layer is provided between the inner surface of the outer fabric layer and the intermediate functional film layer. The heat-reflecting layer is a vacuum-deposited aluminum film with a thickness of 30 nm, which has a high reflectivity (greater than 95%) for atmospheric window infrared radiation with a wavelength of 8 μm to 14 μm, effectively blocking the radiation of infrared heat from the inside of the tent to the outside, thereby enhancing the heat retention performance in low-temperature environments at night. The heat-reflecting layer only covers 70% of the inner surface of the outer fabric layer, with the remaining 30% being an uncoated area for direct bonding with the intermediate functional film layer, avoiding peeling due to the difference in thermal expansion coefficient during the shape memory polymer phase change process.

[0013] As another preferred embodiment of the present application, a hydrophilic microporous layer is provided between the inner fabric layer and the middle functional film layer. The microporous layer is made of polyether polyurethane by wet coagulation phase inversion method, with a thickness of 15 μm, a pore size of 0.1 μm to 0.5 μm, and a porosity of 40%. The layer has a one-way moisture guiding function: the inner surface is treated by plasma to introduce carboxyl (-COOH) functional groups, with a contact angle of 35°, which is conducive to adsorbing human sweat; the outer surface remains hydrophobic, with a contact angle of 105°, which prevents external moisture from penetrating in the opposite direction. The structure cooperates with the middle functional film layer to open the air permeation channel of the middle film during the daytime when the temperature and humidity are high, and the hydrophilic microporous layer accelerates the moisture discharge; at night when the temperature is low, the middle film closes the channel, and the hydrophilic layer locks the internal trace moisture to maintain comfortable humidity and avoid excessive dryness.

[0014] The preparation method of the heat-shielding and air-permeable tent composite fabric according to the present application comprises the following steps:

[0015] Step 1: Preparation of the middle functional film layer. Dissolve the polycaprolactone-polyurethane block copolymer in N,N-dimethylformamide to prepare a shape memory polymer solution with a mass concentration of 18%. Add multi-walled carbon nanotubes to the solution, first ultrasonic treatment (power 300 W, frequency 40 kHz, time 30 minutes), and then high-speed shear emulsification (rotational speed 8000 rpm, time 20 minutes) to obtain a uniformly dispersed shape memory polymer / carbon nanotube composite solution. Then, add polystyrene microspheres with a particle size of 200 nm to the solution at a proportion of 8 vol%, stir uniformly, and then flow casting on a polyethylene terephthalate release film by a flow casting machine to control the wet film thickness to be 100 μm. Dry the wet film in a 60°C vacuum oven for 12 hours, then immerse it in tetrahydrofuran for 24 hours to extract the polystyrene microspheres, and then wash it with deionized water and dry it in a vacuum oven at 60°C to obtain a middle functional film layer with a thickness of 50 μm.

[0016] Step 2: Preparation of the outer fabric layer. Select 210D x 210D high-density polyester taffeta, pretreat it by desizing, refining, and bleaching, and then apply fluorocarbon resin waterproofing agent (solid content 20%) by padding-drying-curing process, with a padding rate of 70%, drying temperature of 100°C, curing temperature of 160°C, and time of 90 seconds to obtain a waterproof outer fabric with a contact angle greater than 140°. Then, deposit a 30 nm thick aluminum film on the inner surface of the outer fabric by vacuum evaporation equipment, with an evaporation vacuum degree of 5 x 10 -4 Pa, and a deposition rate of 0.5 nm / s, controlling the plated area to account for 70% of the total area.

[0017] Step 3: Preparation of the inner fabric layer. 40D polyester filaments are knitted into a mesh structure with a grammage of 55 g / m². The mesh structure is immersed in a polyether polyurethane solution in N,N-dimethylformamide (concentration 12%) and coated with a doctor blade to control the wet film thickness to 25 μm. Subsequently, the mesh structure is immersed in a deionized water coagulation bath for phase inversion to form a microporous structure. After being taken out, the mesh structure is dried at 60°C, and the inner surface is subjected to atmospheric pressure plasma treatment (power 200 W, treatment time 60 seconds, working gas air) to introduce hydrophilic groups.

[0018] Step 4: Composite molding. The intermediate functional film layer obtained in step 1, the outer fabric layer obtained in step 2 (aluminum film facing the intermediate film), and the inner fabric layer obtained in step 3 (microporous layer facing the intermediate film) are sequentially stacked. A two-component polyurethane hot melt adhesive (NCO content 4.5%) is used as the adhesive, and the coating amount is 15 g / m². The lamination is carried out by a hot press laminating machine at a temperature of 110°C, a pressure of 0.3 MPa, and a linear speed of 2 m / min to obtain the final heat-shielding and air-permeable tent composite fabric.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1. When the ambient temperature is lower than 32°C, the intermediate functional film layer is in a dense state, and the overall air permeability is less than 5 mm / s. At the same time, the outer aluminum film reflects the internal infrared radiation, and the inner hydrophilic microporous layer locks the moisture, thereby achieving efficient heat preservation.

[0021] 2. When the ambient temperature is higher than or equal to 32°C, the carbon nanotubes absorb solar radiation heat and conduct it to the shape memory polymer matrix, triggering the phase change of the matrix, opening the pores of the intermediate film layer, and increasing the air permeability to more than 120 mm / s. At the same time, the outer high-density fabric shields direct sunlight, and the inner hydrophilic structure accelerates the moisture removal, thereby achieving efficient heat dissipation and dehumidification. This process is completely driven by the environmental heat signal without the need for external energy or manual intervention. DETAILED DESCRIPTION

[0022] The present application discloses a heat-shielding and air-permeable tent composite fabric and a preparation method thereof. By constructing an intermediate functional film layer integrating light-heat conversion, shape memory, and controllable pores, and integrating it with a heat-reflecting layer and a hydrophilic microporous layer, the present application realizes for the first time an adaptive heat management mechanism integrating sensing, responding, and executing in one body in the tent composite fabric. The composite fabric can independently regulate the air permeability and heat-shielding ability according to the ambient temperature without external energy intervention, thereby effectively solving the technical problem that the traditional tent fabric cannot dynamically balance the heat dissipation and heat preservation needs in the alternating day and night or sudden weather change scenarios.

[0023] The technical solutions of the present application will be described in detail below with reference to specific examples and comparative examples to ensure that those skilled in the art can fully understand and implement the present application.

[0024] Example 1: Using patented optimal parameters, the outer fabric is 210D×210D high-density polyester taffeta (warp and weft density ≥210T, fluorocarbon resin waterproof treatment, contact angle 145°), the intermediate functional film layer is 50μm thick (polycaprolactone-polyurethane block copolymer, glass transition temperature 32℃, with 1.5wt% multi-walled carbon nanotubes added, outer diameter 15nm, length 2μm, specific surface area 250m² / g, purity 95%, containing 8vol% polystyrene microspheres to form a three-dimensional interconnected pore structure), and the heat reflective layer is 3... A 0nm vacuum-deposited aluminum film (70% coverage, 95% reflectivity to 8-14μm infrared radiation) is used. The inner layer is made of 55g / m² polyester fiber mesh fabric (42% porosity). The hydrophilic microporous layer is 15μm thick (polyether polyurethane, 0.3μm pore size, 40% porosity, 35° inner surface contact angle, and 105° outer surface contact angle). Each layer is laminated with a two-component polyurethane hot melt adhesive (4.5% NCO content, 15g / m² coating amount) at 110℃, 0.3MPa, and a linear velocity of 2m / min.

[0025] Example 2: The thickness of the intermediate functional film layer was adjusted to 60 μm, and the other parameters were the same as in Example 1.

[0026] Example 3: The weight of the inner fabric was adjusted to 45g / m², and the other parameters were the same as in Example 1.

[0027] Example 4: The length of the multi-walled carbon nanotubes was adjusted to 3 μm, and the other parameters were the same as in Example 1.

[0028] Example 5: The reflectivity of the heat-reflective layer for 8-14μm infrared radiation was adjusted to 97%, and the remaining parameters were the same as in Example 1.

[0029] Comparative Example 1: No carbon nanotubes were added to the intermediate functional film layer (the other parameters were the same as in Example 1), simulating the traditional shape memory film scheme without carbon nanotubes.

[0030] Comparative Example 2: No heat-reflective layer is provided on the inner surface of the outer fabric (other parameters are the same as in Example 1), simulating a scheme without an infrared reflection structure.

[0031] Comparative Example 3: No hydrophilic microporous layer was provided between the inner fabric and the intermediate functional membrane layer (the other parameters were the same as in Example 1), simulating a scheme without a one-way moisture-wicking structure.

[0032] Performance testing methods:

[0033] Intermediate membrane thickness: Using a micrometer with an accuracy of 0.001 mm, 10 test points were randomly selected in different areas of the membrane layer, and the average value was taken as the final thickness.

[0034] Carbon nanotube addition amount: under nitrogen atmosphere, the temperature was raised from room temperature to 800℃ at a rate of 10℃ / min, and the addition amount was calculated according to the mass difference between the carbon nanotube and the polymer matrix;

[0035] Thermal reflective layer coverage and reflectivity: coverage was measured by image analysis, the inner surface of the outer layer fabric was photographed by high-resolution optical microscope, and the software was used to count the proportion of aluminum film coverage area; infrared reflectivity was measured by Fourier transform infrared spectrometer in the wavelength range of 8μm-14μm;

[0036] Hydrophilic microporous layer contact angle: using contact angle measuring instrument, 5 test points were selected on the inner and outer surfaces of the hydrophilic microporous layer respectively, 2μL of deionized water was added, and the contact angle image was photographed in real time, and the average value was taken;

[0037] Air permeability: using fabric air permeability instrument, under constant temperature environment of 25℃ and 35℃, the test pressure difference was controlled at 125Pa, the air permeability of the fabric was measured, and the average value was taken after testing 3 times for each sample;

[0038] One-way moisture transfer amount: using dynamic moisture transfer tester, the human body sweating environment was simulated, the moisture mass transferred from the inner layer to the outer layer of the fabric within 24 hours was measured, and the moisture transfer amount per unit area per unit time was calculated;

[0039] Thermal response time: the fabric sample was placed under a standard solar radiation simulator (irradiance 1000W / m 2 ), the surface temperature of the intermediate functional film layer was monitored in real time using an infrared thermometer, and the time required for the temperature to rise from 25℃ to 33℃ was recorded;

[0040] Tensile strength: using a universal material testing machine, the intermediate functional film layer was cut into a standard sample of 150mm×25mm, the tensile rate was set at 50mm / min, the maximum tensile stress at break was measured, and the average value was taken after testing 5 times for each sample.

[0041] Performance test data comparison table:

[0042]

[0043] All embodiments meet the core requirements of low-temperature insulation and high-temperature heat dissipation. When the ambient temperature is below 32℃, the air permeability is less than 5mm / s (3.8-4.2mm / s), reducing heat loss; when the temperature is ≥32℃, the air permeability is greater than 120mm / s (128-135mm / s), enabling rapid heat dissipation; the infrared reflectivity is ≥95% (95-97%), providing strong nighttime insulation; the unidirectional moisture conduction is 78-82g / (m²·h), effectively removing internal moisture; the thermal response time is 88-92s, allowing for rapid response to temperature changes; and the tensile strength is 14.5-14.7MPa, demonstrating excellent structural stability. Furthermore, adjusting parameters such as the thickness of the interlayer membrane, the weight of the inner fabric, the length of the carbon nanotubes, and the infrared reflectivity within the specified range does not result in significant performance fluctuations, proving the stability and applicability of the patented technology.

[0044] Comparative performance defects:

[0045] Comparative Example 1, due to the absence of carbon nanotubes, showed that the thermal response time increased from 90s to 210s (unable to quickly trigger phase change and air permeability), the tensile strength decreased from 14.6MPa to 8.2MPa (reduced structural load-bearing capacity), and the high-temperature air permeability decreased to 122mm / s (reduced heat dissipation efficiency). This demonstrates that the photothermal conversion acceleration and structural reinforcement effects of carbon nanotubes are one of the core advantages of the patent.

[0046] Comparative Example 2, due to the lack of a heat reflective layer, saw its infrared reflectivity drop from 95% to 30% (a large amount of internal heat is lost through infrared radiation at night, resulting in a sharp drop in insulation capacity), demonstrating the crucial role of the heat reflective layer in low-temperature insulation.

[0047] Comparative Example 3, due to the lack of a hydrophilic microporous layer, had a unidirectional moisture conduction capacity that decreased from 80 g / (m²·h) to 15 g / (m²·h) (internal moisture could not be effectively discharged, and condensation was easily formed), proving that the unidirectional moisture conduction function of the hydrophilic microporous layer is an important guarantee for maintaining internal comfort.

[0048] This invention achieves integrated functions of temperature self-response breathability regulation, infrared heat preservation, and one-way moisture wicking without external energy by synergistic design of intermediate functional film layer (shape memory polymer + carbon nanotube + pre-set pores) + heat reflective layer + hydrophilic microporous layer. It solves the problems of traditional tent fabrics such as the inability to dynamically balance heat dissipation and heat preservation and moisture accumulation. It is of great significance for upgrading tent equipment in outdoor, emergency, and military scenarios.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sun-blocking and air-permeating tent composite fabric, characterized in that, The outer fabric layer, the middle functional film layer and the inner fabric layer are sequentially stacked; The outer fabric layer is a high-density polyester or nylon fabric with a higher weft and warp density than 210T, and its surface is treated with fluorocarbon resin waterproofing, with a contact angle greater than 140°. The inner fabric layer is a lightweight polyester mesh fabric with a grammage of 45g / m² to 65g / m² and a porosity of 35% to 50%. The middle functional film layer is composed of a shape memory polymer matrix and uniformly dispersed carbon nanotubes, with a thickness of 25μm to 80μm. The shape memory polymer is a polycaprolactone-polyurethane block copolymer with a glass transition temperature of 32℃. The carbon nanotubes are multi-walled carbon nanotubes with an outer diameter of 10nm to 20nm, a length of 1μm to 5μm, and a specific surface area of 250m² / g. The mass fraction of carbon nanotubes in the shape memory polymer matrix is 1.5wt%. The middle functional film layer is internally provided with a three-dimensional through-pore structure formed by a template-assisted phase separation method. The pores are formed by polystyrene microspheres with a particle size of 200nm as porogens after solvent extraction, with a pore volume fraction of 8%. A heat-reflecting layer is provided between the inner surface of the outer fabric layer and the middle functional film layer. The heat-reflecting layer is a vacuum evaporated aluminum film with a thickness of 30nm, covering an area of 70% of the inner surface of the outer fabric layer, and the remaining 30% is an uncoated adhesive area. A hydrophilic microporous layer is provided between the inner fabric layer and the middle functional film layer. The hydrophilic microporous layer is made of polyether polyurethane by wet coagulation phase inversion method, with a thickness of 15μm, a pore size of 0.1μm to 0.5μm, and a porosity of 40%.

2. The sun-blocking and air-permeating tent composite fabric according to claim 1, characterized in that, The heat-reflecting layer has a reflectivity of greater than 95% for infrared radiation with a wavelength of 8μm to 14μm.

3. The sun-blocking and air-permeating tent composite fabric according to claim 1, characterized in that, The inner surface of the hydrophilic microporous layer is treated with plasma to introduce carboxyl functional groups, with a contact angle of 35°, and the outer surface has a contact angle of 105°, forming a one-way wetting structure.

4. The sun-blocking and air-permeating tent composite fabric according to claim 1, characterized in that, The soft segment of the shape memory polymer is polycaprolactone with a number average molecular weight of 80000, and the hard segment is a urethane structure generated by the reaction of 4,4'-methylenebis(phenyl isocyanate) and 1,4-butanediol, with a hard segment content of 25wt%.

5. The sun-blocking and air-permeating tent composite fabric according to claim 1, characterized in that, The layers are bonded by two-component polyurethane hot melt adhesive, with a content of 4.5% and a coating amount of 15g / m². The compounding conditions are temperature 110℃, pressure 0.3MPa, and line speed 2m / min.

6. A method for preparing a heat-shielding and air-permeable tent composite fabric, characterized by, The method comprises the following steps: Step 1: preparing the intermediate functional film layer, dissolving polycaprolactone-polyurethane block copolymer in N,N-dimethylformamide to prepare a shape memory polymer solution with a mass concentration of 18%, adding multi-walled carbon nanotubes into the solution, first ultrasonic treatment, then high-speed shear emulsification, obtaining a uniformly dispersed shape memory polymer / carbon nanotube composite solution, then adding polystyrene microspheres with a particle size of 200 nm into the solution at a proportion of 8 vol%, stirring uniformly, then casting film on a polyethylene terephthalate release film through a casting machine, controlling the wet film thickness to be 100 µm, placing the wet film in a 60°C vacuum oven for drying for 12 hours, then immersing in tetrahydrofuran for 24 hours to extract the polystyrene microspheres, then washing with deionized water and vacuum drying at 60°C, obtaining an intermediate functional film layer with a thickness of 50 µm; Step 2: Preparation of the outer fabric layer, using 210D x 210D high-density polyester taffeta, after desizing, refining, and bleaching pretreatment, fluorocarbon resin waterproofing agent is applied using the padding-drying-curing process, with a pick-up rate of 70%, drying temperature of 100°C, curing temperature of 160°C, and time of 90 seconds, obtaining a waterproof outer fabric with a contact angle greater than 140°, then, a 30 nm thick aluminum film is deposited on the inner surface thereof by vacuum evaporation equipment, with an evaporation vacuum degree of 5 x 10 -4 Pa, deposition rate of 0.5 nm / s, and control of the plated area accounting for 70% of the total area; Step 3: Preparation of the inner fabric layer, using 210D x 210D high-density polyester taffeta, after desizing, refining, and bleaching pretreatment, fluorocarbon resin waterproofing agent is applied using the padding-drying-curing process, with a pick-up rate of 70%, drying temperature of 100°C, curing temperature of 160°C, and time of 90 seconds, obtaining a waterproof inner fabric with a contact angle greater than 140°, then, a 30 nm thick aluminum film is deposited on the outer surface thereof by vacuum evaporation equipment, with an evaporation vacuum degree of 5 x 10 -4 Pa, deposition rate of 0.5 nm / s, and control of the plated area accounting for 70% of the total area; Step 4: Preparation of the middle fabric layer, using 210D x 210D high-density polyester taffeta, after desizing, refining, and ble Step 3: preparing the inner layer fabric layer, using 40D polyester filaments to weave into a mesh structure with a grammage of 55 g / m², immersing it in a polyether polyurethane N,N-dimethylformamide solution, controlling the wet film thickness to be 25 µm through doctor blade coating, then immersing in a deionized water coagulation bath for phase inversion to form a microporous structure, taking it out and drying at 60°C, then performing atmospheric pressure plasma treatment on the inner surface to introduce hydrophilic groups; Step 4: composite molding, stacking the intermediate functional film layer obtained in step 1, the outer layer fabric layer obtained in step 2 and the inner layer fabric layer obtained in step 3 in order, using two-component polyurethane hot melt adhesive as the adhesive, coating amount being 15 g / m², laminating through a hot press laminating machine under the conditions of a temperature of 110°C, a pressure of 0.3 MPa and a linear speed of 2 m / min, obtaining the final heat-shielding and air-permeable tent composite fabric.

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